TRELON Wastewater Treatment Plant, Trélon, Hauts-de-France

The TRELON wastewater treatment plant is located in Trélon, a commune in the Nord department of the Hauts-de-France region, France. This facility serves a population of approximately 2,813 residents and operates under the regulatory framework of the European Union's Urban Waste Water Treatment Directive (91/271/EEC). As a small agglomeration, it is required to provide appropriate treatment to protect the local environment. The plant provides secondary treatment, which is the standard level for inland freshwater discharges under the EU directive. It has a designed capacity of 4,083 m³/day and currently discharges an average of 501.83 m³/day of treated wastewater. The facility is situated inland, more than 50 km from the coast, and its treated effluent is released into the local watershed. The receiving water body is part of the Scheldt basin, which drains into the North Sea. The plant plays a crucial role in maintaining water quality in the region, supporting aquatic life and downstream ecosystems. Its operation helps prevent nutrient pollution and protects the ecological health of the river system.

The TRELON plant discharges into the local river system within the Scheldt basin, which flows through northern France and Belgium before reaching the North Sea. The watershed supports diverse aquatic habitats and is important for migratory fish species. The plant's secondary treatment reduces organic pollutants and suspended solids, helping to maintain water quality in this sensitive riverine environment.